Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Tunnelling and Josephson Junctions I
TT 6.4: Vortrag
Montag, 18. März 2024, 10:15–10:30, H 3010
Experimental and simulated realization of magnetization-controlled critical current in a ferromagnetically constricted Josephson junction — •Lukas Kammermeier and Elke Scheer — Universität Konstanz
We present an experimental realization of a magnetization (M) controlled Josephson junction in a superconductor-ferromagnet S-S’-S (S’=S/F) hybrid structure, which allows for a post-manufacturing manipulation of the critical current Ic. We observe multiple and non-monotonic discrete jumps of Ic(M) up to full supression depending on the magnetic history. In addition we reproduce the observed effects in micromagnetic simulations with MuMax3 [1] and a simple model of stray-field-mediated suppression of Ic. Resulting in a semi quantitaive microscopic explanation for the jumps in the Ic(M) measurements.
[1] A. Vansteenkiste, AIP Advances 4 (2014) 107133